ERL L-PRO 4000, Руководство пользователя

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7 Acceptance/Protection Function Test Guide
D02706R02.30 L-PRO 4000 User Manual 7-25
3. Apply the following 3-phase currents to the relay main ac current terminals:
Ph A: 300 – 301, 5.3 A <-30

Ph B: 302 – 303, 5.3 A <210

Ph C: 304 – 305, 5.3 A <90

4. Observe target Load Encroachment.
5. Disable Load Encroachment, repeat steps 2-3.
6. Observe 21P3 Alarm/Trip.
End of Load Encroachment test.
Weak Infeed
Test
Weak Infeed tripping operates on 4 basic conditions:
1. Low Positive Sequence Voltage (27V1) or High Neutral Voltage (59V0)
2. No Zone 2 or Zone 4 reverse element picked up.
3. Loss of Potential (60) element dropped out
4. Permissive trip received from the remote end
Figure 7.16: Weak Infeed Logic
For this test apply 0 voltage and 0 current to the relay with no prefault. This
causes the first 3 conditions to be met: (27V1, NOT (Zone 2 OR Zone 4R),
NOT Loss of Potential).
In this case a Virtual Input is set up to simulate the Permissive Trip Receive
contact via ProLogic.
Figure 7.17: Scheme Selector Settings (Offliner)
113
111
0
TWD3
3ms
TWD2
108
110
6ms
TWD1
112
20ms
0
60
27 V1
59 V0
Weak
Infeed
Enable
Switch
21-2
21-4R
Receiver
Scheme
Trip Scheme
Send